Basically you get what you pay for. I'd advise against it and suggest to get a set of koni/bilstein shocks and lowering springs (e.g. vogtland, h&r sport, etc...) instead. You'll get much better handling characteristics and with the konis you can get reboud adjustability.
Spec e36 cars use the koni/vogtland combo on the track. its a great setup. FYI, vogtland springs are made from VVS. They also make the springs for TC Kline and their coil-over setups.